diff options
| author | Ian Dall <ian@beware.dropbear.id.au> | 2009-02-11 13:04:46 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-02-17 09:28:45 -0800 |
| commit | 523669a7d56b5e2ee2575c6b5db2d504fa8b1c24 (patch) | |
| tree | 7e6f229f80f14aec110804137c87417927a80d9f /drivers/w1 | |
| parent | d371ac207cde70ea31332b60dcbe52db77a76604 (diff) | |
w1: w1 temp calculation overflow fix
commit 507e2fbaaacb6f164b4125b87c5002f95143174b upstream.
Addresses http://bugzilla.kernel.org/show_bug.cgi?id=12646
When the temperature exceeds 32767 milli-degrees the temperature overflows
to -32768 millidegrees. These are bothe well within the -55 - +125 degree
range for the sensor.
Fix overflow in left-shift of a u8.
Signed-off-by: Ian Dall <ian@beware.dropbear.id.au>
Signed-off-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/w1')
| -rw-r--r-- | drivers/w1/slaves/w1_therm.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c index 2c8dff9f77d..1ed3d554e37 100644 --- a/drivers/w1/slaves/w1_therm.c +++ b/drivers/w1/slaves/w1_therm.c @@ -115,7 +115,7 @@ static struct w1_therm_family_converter w1_therm_families[] = { static inline int w1_DS18B20_convert_temp(u8 rom[9]) { - s16 t = (rom[1] << 8) | rom[0]; + int t = ((s16)rom[1] << 8) | rom[0]; t = t*1000/16; return t; } |